Rollup merge of #69591 - matthewjasper:query-response-relate, r=nikomatsakis

Use TypeRelating for instantiating query responses

`eq` can add constraints to `RegionConstraintData`, which isn't allowed during borrow checking outside of a `CustomTypeOp`. Use `TypeRelating` instead to always push constraints to the obligations list.

closes #69490

diff --cc src/librustc_infer/infer/canonical/query_response.rs
Simple merge